Edward g



(No Model.)

B. G. STOY. FOLDING SQUARE.

Patented'Mar. 16, 1897.

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EDI/VARD G. STOY, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TO ALBERT A. CLEM, OF SAME PLACE.

FOLDING SQUARE.

SPECIFICATION forming part of Letters Patent No. 9,023, dated March 16, 1897.

Application filed March 16, 1896. Serial No. 583,480. (No model.)

To (0% whom it may concerm Be it known that I, EDWARD G. STOY, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Squares, of which the following is a specification.

My invention relates to a new and useful improvement in squares, an d has for its object to provide such a tc 01 which when out of use may be folded into a small compass after the manner of a pocket-knife and when open will be as accurate as though the blade were stationary.

WVith these ends in view my invention consists in the details of construction and combination of elements hereinafter set forth, and

' then specifically designated by the claim.

In order that those skilled in the art to which this invention appertains may understand how to make and use the same, Iwill describe its construction and operation in detail, referring by letter to the accompanying drawings, forming a part of this specification, and in which- Figure 1 is a perspective of my improvement, the blade being distended; Fig. 2, a similar view showing the blade folded within the beam; Fig. 3, a horizontal section showing the arrangement of the spring relative to the beam and blade when the latter is in the two positions indicated in the full and dotted lines; Fig. 4, a section at the line 4 4c of Fig. 3.

Similar letters denote like parts in the several views of the drawings.

In carrying outmy invention I provide a beam A, which is slotted or may be made of two sections and secured together so as to permit the blade 13 being pivoted therein by means of the screw 0, which is passed through a bushing D, set in the thickened portion of the blade. This screw is preferablyprovided with a slotted head and may also be provided with two holes E, by means of which a wrench may be applied thereto for the purpose of tightening a screw, so as to hold the blade in any desired adjustment.

F is a spring which is secured within the slot in the beam by the screws G, and its free end is adapted to bear against the nd of the plate when in its open position, as shown in full lines in Fig. 3, and against the inner edge of said blade when the latter is closed, and the inner end of the blade is provided with an offset II, which forms a continuous line with the outer edge of the blade and is so arranged as to strike and bear against the backplate I, which is secured along the back edge of the beam for the purpose of covering the spring, and this arrangement determines the distended position of the blade in order that no adjustment is required when the blade is closed within the beam, as shown in Fig. 2. The spring E bears upon its inner edge and serves to hold it closed, so that it may be closed in a small space or carried in the pocket.

When a bevel is to be described by my improvement, the blade is turned to the desired position, which will be indicated by the proper graduation of the series J, registering with the inner edge of the beam, and the blade may be secured in this adjustment by setting the screw with a suitable driver or wrench.

The corner K, against which the spring bears when the blade is being swung upon its pivoted point, is preferably rounded, so as to prevent cutting and permit the blade to be more readily moved; also, the center portion of the slot may be made wider than the end thereof in order that this end may serve as bearings to guide the blade and prevent it from being sprung when pressure is brought to bear thereon.

In practice my improvement has been found to be very convenient in that when out of use it may be folded into a small space and either be carried in the pocket or otherwise stored away, and yet when desired for use may be quickly opened, when it will serve for either a square or bevel as accurately as though the beam and blade were made stationary relative to each other.

Having thus fully described my invention, what I claim as new and useful is A square consisting of a beam formed of a single piece of materialhaving its back extend approximately midway of its length and being cut away the remainder of its length, a plate arranged on the back extending the length of the beam, a spring secured on the under surface of the back and extending over the cut-away portion thereof, a blade having an extension to abut the back plate, said fixed my signature in the presence of two subblade having an enlarged shank fitting in the scribing witnesses. enlarged Way formed in the beam, the blade proper having its forward end fitting in a re- 1 5 dueed slot formed in the opposite end of the Witnesses:

w beam as and for the purpose described. S. S. WILLIAMSON,

In testimony whereof I have hereunto af- E. O. WVURDERMAN.

EDVARD G. SITOY. 

